Tire-trimming machine



July 16, 1929. HAASE 1,721,298

TIRE TRIMMING MACHINE Filed Nov. 19, 1925 2 Sheets-Sheet July 16, 1929.J, I, HAASE 1,721,298

TIRE TRIMMING MACHINE Filed Nov. 19, 1925 2 Sheets-Sheet 2 3mmfiorgcm 1. arm,

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akbzmq Patented July 16, 1929. 1 UNITED, STATES 1 1 ;H E or new; c aomew-To THE ee rawr ma mime 1,721,298 PAT NT. FFICE- .1

COMPANY, AKBQNQ-KOHIQ, AYQQRPPRMWION OEpHIQ, Y

m answammme ,iyraonms,

Application filed uovem ier ia, 192 5. seriai'n "ion 16 My inventionrelates to tire trimming machines and t has particular reference toamachine adapted to remove excess rubber froin the base band of a solidor cushion tire.

It is customary in manufacturing tires of the above designated characterto vulcanize the rubber tread portion upon ametal run, while the partsare maintained in assembled relation in a mold designed for thispurpose.

During vulcanization, excess rubber creeps out of the mold adjacent therun and it is removed beforemarketing the tire to render the articlemore saleable by reason of its im-" proved appearance. ,lleretot'or-e,tliet-rimining operation has been performed manuallv.

The object of the invention is to provide a machine by means of whichexcess rubber, or

overflow may be readily removed from the vulcanized tire. In thepreferred embodiment of the invention described ,herein', the

tire is rotatably mounted and is held in delinite relation to cuttingclementsivhich arelim-j pressed upon the surface of the tire'to remove 1the excess rubber.

In the dra wings: Fig. 1 is a perspective view of the machine with atire mounted thereon;

Fig. 2 is a perspective ViG. W of .one unitot the machine drawn on alarger scale; I p

Fig. 3 is a detail view in end elevation of a cutting tool; 2 p

Fig. 4 is a plan view thereof; and

Fig, 5 is a detailed view in end elevation beyond the bearings 11 on onesideof t re machine and havekeyed thereto sprocket wheels 14 which areinterconnected ;by suitable vdrive, such as a chain 15. One ofthetrunnions 13 is provided at the opposite side ottlie frame .with aprojecting portion to which 11s secured a. gear wheel'lG, that engagesasuitable train of driving mechanism, indicated generally by thereference nuiiieral ln which is connected to a suitable source of power,such as a motor 18, to provide a means for positively rotating thero1lers'12.

Bosses are provided at each corner of the frame 10 adjacent the journalboxes 11 and are adapted toreceive upright circular posts 21, 22, 23 and24, whichare intercom neete d at their upper extremities by a spider'25'having four arms 26 which pro'ect'radially from a circular'hubportion whereby to form a supporting'frame, The posts are suitablythreaded and shouldered to permit of rigid assembly of the associatedparts by" *means'of nuts 28. Their per time of the spider is machined toprovide bearing seats for t-helegs 29 of'a support 30, which con- 'vergeupwardly and merge into a split collar "32th which 1s clampeda' cylinder33, extend spider y A pston rod 34 of the cylinder'33 extends ingdownwardly to the? hub] portion 27 of the through an aperture/formed.the hub 27 at'its outer end by means of and is connected afsi'v'ivel 8-5to a slide indicated generally by the reference'character 36. 'Four'arms370xtend outwardly from the central portion of the slide36 and mergeintoflrsleeves '38 which,

surround the posts2l 22, 23 and 24; Extend jinc'between adj acentpai rsofthearrns $7 on 'bpposite sides of the macl1ii e a1'e bridges 39 whichhave secured'tliereto aides ill upon which are "piyotal ly' mountedtriangulaiz, frames 42. 'best sho'wn in Fig, 5, each frame 42 .isprovidedat its upperapex with a boss lfiwhichprovides a bearing for theaxle 11 and at its lower aplices with portions a p d. t .lzeeeiv x im uo which are rotatablymounted two idle rollers 46; V, i

It is to be understood that the cylinder 33 is adapted to receive asuitable fluid,such as compressed air, which may be employed to raiseorto lpwerthe s'lide36 to ether with the rollers lfi mounted thereon. il-referably, ai'r'is admitted fiom'the underside of the cylind 2:threu'ghxa, conduit 4C8, which ,ex-

tends-from a control Valve 49, suitably COB-Q ac ted by apipeline ,51 toa high pressure reservoir, not ,shown- T e ail supporting the pistonwithin the cylinder and the slide .36 is permittedto escape through aconduit .52 when it is desired tolower the slide 36, which descendstherefore solely through, the

force efxerted by its own weight. It is apparentthat the weight of theparts forming the slide ,36 will impart to it considerable momentum,Whichmight reach a value suff fie ent todamage the-machine or the the Twhen the rollers {16 come ,into contact with the periphery-thereof.

Accordingly, a-throtthe mechanism is provided which is adapted m preventthe rapid escape stair through the pipe 352 as the rollers A6 approachthe tire, and, hence, so retard the descent that the rollers and tirecontact with each other gradually, and withoutsufficient impact todevelop excessive strains within the machine. 6

secured to the outer face of the member 66. Compressed air may beintroduced on either The mechanism for accomplishing this resultcomprises a rod 1, wlnch is pivotally supported from a link 56, whiclrinturn v is pivoted to a link 57 by a link 58. The link 57.is secured tothe valve stem 58 of'a valve .59, interposed in the discharge conduit 52between the outer aperture 60 thereof and the cylinder 33. WVhen' theslide 36 is elevated above the surface of the'tire T, the rod 54isdisposed below the lower edge of the rollers 46, by virtue of its ownWeight .rod 54r-first contacts with the tire.

and. hence, as the slide 36 is lowered, the As the rod moves upwardlyrelatively to the rollers 46, upon initial contact with the tire, the

links 56, 58 and 57 are actuated to partially close the valve 59 andhence reduce the rate of. escapeofthe compressed air from the cylinder33. A throttling efi'ect isthereby produced which maintains a sutlicientpressure Within the cylinder 33 to retard the rate of descent of theslide v36 and hence allow the rollers 46.to come into gradual contactwith the tire T and thereby avoid the developmentiof destructivestresses. The piv otal suspension of the rollers 46 upon the the track65 formed in the frame. rality ofJoolts 69'are disposed in the frame 68and, in slots 71 formed in a depending portion 72 o fa. bearing 73.Coiled springs 7 1'a re interposedbetween the depending portion 72andthe ektremities ofthe bolts, and

thus provide a means for resiliently mount- .ing the bearil ig 73 uponthe member66. .A stop plate 75 overhanging the upper edge of theface mayalso be secured to the portion 72 to providemeans .to limit the downward displacement of the bearing 73.

A shaft 76 extendingthrough the bearing 73 has mounted on it two idlerollers 77 which i are adaptedto contact with thesurface of .the tireJna manner which will beexplained presentlyf A third idle roller 78 mayalso be positioned upon the face 68 of the member 66 through the mediumof bearing blocks 79. Preferably the axis of the roller 78 is at rightangles to the axis of the roller 77 sideof thepiston within the cylinder81 for the purpose of moving the member 66 with .its associated partstoward or away from the tire. The actuating fluid may be introduced fromthe compressed air line 51 and may be distributed through asuitablydisposed valve 83 and pipe lines 84 and 85.

A plurality of fixed idle rollers 87, oppositely disposed to the idlerollers secured on the member 66, are provided on the frame 10 and theupright posts 21 and 22, as shown in Fig. 1. The rollers 87 arepreferably mounted upon a fixed axle 88 which is secured between theposts 21 and 22 by means of. two brackets 89 and 90. A thirdfixedroller, not shown, may also be provided in a suitably mounted bearingpositioned within the frame of the machine and aligned with the roller78 mounted upon the member 66.. All the rollers employed for the purposeof supporting and positioningthe tire within the machine may be of anydesired construction, but it is-preferred to cover them with a thinlayer of rubber in order to reduce the possibility of damage to thetire, and to provide a certain degree of resiliency in their contacttherewith.

Two similarly constructed trimming units are assembled upon the machine,one unit being mounted preferably upon a bracket 92 secured to themember 66, and the other upon a bracket 98 which may be positioned uponthe post.21. Each bracket has a Ushaped arm 9% swivelly mounted at theouter end thereof. Pins project through apertures 95 in the tinesof the"arms 9%1 and into recesses 96 which are formed in a tool supportingsleeve 97. As best shown in Figs. 3 and 4, the tool comprises ahexagonally shaped head 101, three faces of which are provided withrectangular slots 102, adapted to receive knives which may be securedthereinby suit able means, such as set screws or bolts 103. .F orconvenience in assembly, the head may be made in two parts which aresecured together by bolts 10 1.

I The knives 106, 107 and 108 may be made from ordinary tool steel andmay be provided with various types of contours which are adapted forspecial purposes. For example,

riage for trimmingexcess' material fro'mr-the tires. 1 v I 4. A! machinefor trimming a vehicle tires comprising, stationary? supporting rollers,movable supporting-rollers so disposed as'to coact with the stationaryrollers to maintain vehicletires in position upon the'sta tionaryrollers; a carriage associated with both :sets of supporting; rollersand movable I longitu dinally-thereof, cutting means secured to thecarriage: inposition to contact with the sides of the tires, and meansto-operate the-carriage.-

5. 'A machine for :trimming; vehicle tires comprising means forsupporting ;and-- rotating .the'tires, a swivellymounted sleeve disposedadjacent the supporting means, a knife holder rotatablypmounted'withinthe sleeve, a spring actuated lock inechanism associated with-the sleeveand the holder 'for securing the holder againstrotation within-thesleeve, and a trimming knife mounted in the holder in position'tocontact with the) side's'of tires.

6. Annachine for trimming vehicle tires comprising means for supporting,and 'rotating the tires, 1 a swivelly mounted-sleeve disposed adj acentthe supporting means, a knife holder rotatablyamounted within thesleeve, a springtactuated lock-mechanism, associated with the 'sle'eve=and'the holder for securing the holder against rotation within thesleeve,

and a plurality of trimmingkni'ves secured to the'holder i'n position tocontact with the sides of tires, each 01- the-knives havingta dif-'ferent' edge configuration.

7. In a 'machine-- for trimming vehicle tires, means for supporting androtating -.the tires,'a movable knife holder-associated with thesupporting means, a knife secure'd-tothe holder comprising a rimcontacting portion and a cutting di'sc mounted ina plane 'substantial-lyin-paral-lel relation with respect to said portion:

8. A machine for trimming-vehicle-tires comprising lower supportingrollers, a carriage associated therewith, upper'supportm-g rollersmounted thereon in parallel relation with respect to the-first mentionedrollers, means associated with the carriage :for'check ing:-the I ratewith which the icarriaga: ape

lit-21,298

preaches tires-mounted uponthe lower "rollers; 5 and means associatedwith the machine forrtrimmingmaterial fromthe tires.

9; Ai machi'ne -for I trimming wehicletires comprising;stationary.supporting; rollers, a reciprocating '.carriaige -.mount'ed -or movemelnlr-in a direction parallel to the rollers, guide rollers mountediipon the carriage in position to -contact with the one 'sideof a themounted upon the supporting roll'ers, a second-set ofvguide rollerssomounted as to-contact with the oppositeside of the tire, a trim ming.knife mounted upon the carriage, means to sooperate' the 'knife as tobring it into contact'with the side of -a tire; a -vertically movablecarriage disposed above thesupportin'g; rollers, additionalsupportingrollers secured-to thecarriage in parallel relation-with respect tothe-first mentioned supporting-rollers,-- and' pneumatic means foroperating the lat-te'r carriage: i

10-. machine'- for'trimmin g excess mate rial from rubber vehicle tirescomprisingtparallel. rollers for-supporting and rotating the tires,certainof the" rollers being radially movable with: respect to theothers in order closely to engage thetiressu'pported thereby,awcarriager disposed adjacent to the rollers and movable in a directionsubstantially parallel to the axes of tlie rollers, a'knife holderhingedly secured-to the carriage,and'a knife secured'to the holder'inposition to contact with the side portions of the tires.

'1 1. A machine for trimming rubber vehicle tires comprising. rollersmovable radially with: respect to eachother for support ing'androtatingthe' tires, a carriage support secured adjacent the rollers anda carriage mounted 'for lon'gitudinal' motion toward or away, from *thetires in a direction substantiall-y parallel to the axes of thesupporting roller-s a trimming knife secured to the car riageinpositio'n to contact with the sides of the-tires'and'm'eans foroperating the carri'ages In witnesswhereof, I have hereunto'signed myname.

JORGEN I. HAASE.

